why i'm getting this error?

this error : Subscripted assignment dimension mismatch.

[Stephen23]

What is t ?

[ocsse]

i update the question

Answer 1

[Stephen23]

This line

m(i,:) = a0 + ...

The LHS references 500 elements (because m has size 4x500), whereas the RHS has size 1x2500 (because t has size 1x2500). How do you expect to put 2500 elements into 500?

[ocsse]

thanks